Lecture 6: Chapter 4 David Wallace Croft Statistics for Psychology 2005 Jun 01 Wed Copyright 2005 David Wallace Croft This work is licensed under the Creative Commons Attribution License

Quiz Please mute your mobile phones Write your name on a blank piece of paper Quiz will begin at 09:00 When done, turn your paper over At 09:02, I will say, “Pens down” Writing after “Pens down” is cheating Pass your quizzes to your left

Outline Administrative Correction Dot Product Chapter 4 Slides Emphasis Homework Exam 1 Review Next Class Questions

Administrative If you did not return your exam to me, please do so that I can record the grade I have not yet started entering grades in Blackboard A former T.A. is offering tutoring services

Correction Correction to whiteboard example Example problem had M = 0 Z = X / SD only when M = 0 More generally, Z = (X – M) / SD Both scaling and translation

Dot Product r squared question Epiphany while camping The Cross-product is the Dot Product –

Chapter 4 Prediction Aron and Aron, “Statistics for Psychology”, 3 rd Ed., 2003.

Emphasis When r = 0, the predicted Z score is zero

Homework Chapter 4 Set 1, Problem 6 Do the rest

Exam 1 Review Mean, Median, and Skew

Next Class Friday Read Chapter 5 before class Quiz at start of class Monday Exam will cover Chapters 3, 4, and 5

Questions Don’t pack up to leave just yet Questions about lecture before we dismiss? Post additional questions to discussion electronic mailing list unless personal –